L Carnitine injection is recommended at 1 ampule every 2 3 days for best results. The L Carnitine is taken intravenously either by normal injection or using a butterfly needle. After taking this L Carnitine, you L Carnitine Injectable for Fat Burning & Fitness Male Energy Boost Clinic Pasadena CA L Carnitine Shots Carnitor Levocarnitine 200 mg mL Injection 5 mL McKesson L Carnitine XS 4000, Apple Bomb, 15.72 fl oz (465 ml)